<!DOCTYPE html>
<html>
<head>
  <title>vue select2 封装</title>
  <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet" />
  <script src="https://unpkg.com/vue/dist/vue.js"></script>
  <script src="https://cdn.bootcss.com/jquery/2.2.4/jquery.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
  <style type="text/css">
    .content{
      text-align: center;
      padding:50px;
    }
    .content *{
      text-align: left;
    }
    .select{
      width: 350px;
    }
  </style>
</head>
<body>
<div class="content" id="vue-example">
  <select class="select" v-select2='options' v-model="selectValue"></select>
  <br/>
  <span v-text="'结果：'+selectValue"></span>
</div>
</body>
<script type="text/javascript">
  Vue.directive('select2', {
    inserted: function (el, binding, vnode) {
      let options = binding.value || {};
      $(el).select2(options).on("select2:select", (e) => {
        // v-model looks for
        //  - an event named "change"
        //  - a value with property path "$event.target.value"
        el.dispatchEvent(new Event('change', { target: e.target })); //说好的双向绑定，竟然不安套路
    });
    },
    update: function(el, binding, vnode) {
      $(el).trigger("change");
    }
  });

  var vueApp = new Vue({
    el: "#vue-example",
    data: {
      selectValue: '你还没有选值',
      options: {
        data: [
          { id: 0, text: 'enhancement' },
          { id: 1, text: 'bug' },
          { id: 2, text: 'duplicate' },
          { id: 3, text: 'invalid' },
          { id: 4, text: 'wontfix' }
        ]
      }
    }
  });
</script>
</html>
